EP0199023A1 - Procédé pour diminuer l'émission d'oxydes d'azote par les fours à ciment - Google Patents

Procédé pour diminuer l'émission d'oxydes d'azote par les fours à ciment Download PDF

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Publication number
EP0199023A1
EP0199023A1 EP86102563A EP86102563A EP0199023A1 EP 0199023 A1 EP0199023 A1 EP 0199023A1 EP 86102563 A EP86102563 A EP 86102563A EP 86102563 A EP86102563 A EP 86102563A EP 0199023 A1 EP0199023 A1 EP 0199023A1
Authority
EP
European Patent Office
Prior art keywords
compounds
fuel
cement
raw material
reducing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86102563A
Other languages
German (de)
English (en)
Inventor
Wilfried Dipl.-Ing. Kreft
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0199023A1 publication Critical patent/EP0199023A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C04B7/42—Active ingredients added before, or during, the burning process
    • C04B7/421—Inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/60—Methods for eliminating alkali metals or compounds thereof, e.g. from the raw materials or during the burning process; methods for eliminating other harmful components

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • Cement burning plants generally have a certain emission of nitrogen oxides (NO, NO 2 ).
  • NO x is formed in the combustion process on the one hand by thermal synthesis from elemental nitrogen and oxygen in the combustion air - (thermal NO x ) and on the other hand arises during the combustion of nitrogenous organic components of the fuel (fuel NO x ).
  • the invention is therefore based on the object of designing a method according to the preamble of claim 1 in such a way that the nitrogen oxide emission from cement burning plants is reduced particularly effectively with little operating effort.
  • this reducing agent By adding NH 4 compounds in solid form to the hot gases in a fuel and / or material stream, this reducing agent is not only easy to handle, but above all ensures very effective decomposition of the NO x .
  • this With the known addition of NH3, this must be distributed evenly in the gas space in order to effectively reduce the NO x ; this distribution of the NH3 in the gas space requires a high degree of turbulence.
  • NH 4 salt compounds can be used in the process according to the invention, for example (NH 4 ) 2 CO 3 , NH 4 HCO 3 , NH 4 Cl, (NH 4 ) 2 S 2 O 7 etc.
  • Those compounds are preferred which are: do not bring any problem substances, such as chlorides and sulfates, into the fuel, ie neutral substances, such as (NH 4 ) 2 CO 3 or NH 4 HCO 3 , which only give rise to NH 3 , CO 2 and H 2 O.
  • a possible cleavage reaction is, for example
  • the amounts of NH 4 compounds to be used should correspond approximately to the stoichiometric ratio of NH 3 / NO:
  • NH 4 compounds to the fuel stream (coal stream) is particularly expedient.
  • the cement raw material also contains nitrogen, which can react to NO (which is the case for many raw materials according to American studies)
  • a distribution of the NH 4 compounds over the fuel and material flow is advantageous.
  • the drawing shows a cement kiln, containing a (only partially shown) multi-stage cyclone preheater 1, a rotary kiln 2 and a (not shown) cooler.
  • the hot exhaust gases from the rotary kiln 1 flow through a gas line 3, which forms a precalcination zone, to the lowest cyclones 1a, 1 of the cyclone preheater 1.
  • a cooling air line 4 leads from the cooler to the gas line 3 and opens into the gas line 3 via two sub-lines 4a, 4b.
  • the material discharged from the cyclone 1 of the cyclone preheater 1 is introduced into the lines 4a, 4b via good lines 5a, 5b and is introduced with this air flow into the gas line 3, which forms the precalcination zone.
  • Fuel is introduced into gas line 3 via burner 6.
  • the material discharged from the cyclones 1a, 1b reaches the rotary tube furnace 2 via product lines 7a, 7b.
  • the function of such a cement burning plant is known and therefore need not be explained in detail.
  • the cement raw material preheated in the cyclone preheater 1 is further heated in the precalcination zone formed by the gas line 3 and at least partially deacidified before it reaches the rotary kiln 2 for final firing.
  • the combustion air required for the combustion of the additional fuel supplied to the volcanization zone via the burners 6 is supplied via the cooling air line 4.
  • the system now contains a storage container 8 for NH 4 compounds in solid form, for example (NH 4 ) 2 CO 3 .
  • the NHd connections from the storage container 8 can be added to the fuel (for example, fine coal) supplied via the burner 6 as well as to the material flow supplied to the rotary kiln 2 via the feed lines 7a, 7b via a metering element 9 and a distributor device (not shown in detail).
  • a further possibility indicated in the drawing consists in introducing the NH 4 connections directly into the inlet housing 10 of the rotary kiln 2.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Public Health (AREA)
  • Inorganic Chemistry (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP86102563A 1985-04-16 1986-02-27 Procédé pour diminuer l'émission d'oxydes d'azote par les fours à ciment Withdrawn EP0199023A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853513484 DE3513484A1 (de) 1985-04-16 1985-04-16 Verfahren zur verringerung der stickoxid-emission aus zementbrennanlagen
DE3513484 1985-04-16

Publications (1)

Publication Number Publication Date
EP0199023A1 true EP0199023A1 (fr) 1986-10-29

Family

ID=6268076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86102563A Withdrawn EP0199023A1 (fr) 1985-04-16 1986-02-27 Procédé pour diminuer l'émission d'oxydes d'azote par les fours à ciment

Country Status (2)

Country Link
EP (1) EP0199023A1 (fr)
DE (1) DE3513484A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925475A1 (de) * 1989-08-01 1991-02-07 Krupp Polysius Ag Verfahren zur waermebehandlung von feinkoernigem gut
EP0614690A1 (fr) * 1993-03-11 1994-09-14 Kabushiki Kaisha Kobe Seiko Sho Traitement de gaz d'échappement d'une installation d'incinération
EP0753335A2 (fr) * 1995-07-14 1997-01-15 Karl-Heinz Bruns Procédé et dispositif pour la réduction du niveau de pollution de gaz d'échappement de la fabrication du ciment
FR2900062A1 (fr) * 2006-04-19 2007-10-26 Tredi Sa Procede et dispositif pour la reduction des nox dans des effluents gazeux d'incinerateur.
AU2009355000B2 (en) * 2009-11-04 2013-09-12 Lg Electronics Inc. Visualization device for dust collection of vacuum cleaner
CN112601725A (zh) * 2019-08-01 2021-04-02 太平洋工程株式会社 水泥烧成装置和水泥窑排气的脱硝方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2232972B (en) * 1989-05-06 1993-09-15 Hitachi Shipbuilding Eng Co Treatment of combustion exhaust gas
DE4018786A1 (de) * 1990-06-12 1991-12-19 Krupp Polysius Ag Verfahren zur reinigung der abgase von anlagen zur herstellung von zementklinker
DE19800249A1 (de) * 1998-01-07 1999-07-08 Manfred Dipl Chem Dr Enk Verfahren und Vorrichtung zur Minderung von Schadstoffen bei der Herstellung hydraulischer Bindemittel
DE19954479B4 (de) * 1999-11-12 2008-06-05 Khd Humboldt Wedag Gmbh Verfahren zur Herstellung von Zementklinker mit Kühlung der Drehofeneinlaufkammer
DE10003283A1 (de) * 2000-01-26 2001-08-02 Krupp Polysius Ag Verfahren und Anlage zur Wärmebehandlung von feinkörnigem Gut

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2318835A1 (fr) * 1975-07-23 1977-02-18 Ishikawajima Harima Heavy Ind Procede pour enlever des oxydes d'azote, en particulier dans une installation de calcination de ciment brut
US4181705A (en) * 1978-08-18 1980-01-01 Chevron Research Company Purification of fluidized-bed combustion flue gas

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3021875C2 (de) * 1980-06-11 1985-04-25 L. & C. Steinmüller GmbH, 5270 Gummersbach Verfahren zur Anwendung der selektiven Reduktion von Stickoxiden aus einer Flammenverbrennung mit Hilfe von Ammoniak
DE3407689C2 (de) * 1984-03-02 1987-01-22 Steag Ag, 4300 Essen Verfahren zur Verminderung des NO↓x↓-Gehalts in den Verbrennungsabgasen einer Verbrennungsanlage

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2318835A1 (fr) * 1975-07-23 1977-02-18 Ishikawajima Harima Heavy Ind Procede pour enlever des oxydes d'azote, en particulier dans une installation de calcination de ciment brut
US4181705A (en) * 1978-08-18 1980-01-01 Chevron Research Company Purification of fluidized-bed combustion flue gas

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3925475A1 (de) * 1989-08-01 1991-02-07 Krupp Polysius Ag Verfahren zur waermebehandlung von feinkoernigem gut
EP0614690A1 (fr) * 1993-03-11 1994-09-14 Kabushiki Kaisha Kobe Seiko Sho Traitement de gaz d'échappement d'une installation d'incinération
EP0753335A2 (fr) * 1995-07-14 1997-01-15 Karl-Heinz Bruns Procédé et dispositif pour la réduction du niveau de pollution de gaz d'échappement de la fabrication du ciment
EP0753335A3 (fr) * 1995-07-14 1997-02-26 Bruns Karl Heinz
FR2900062A1 (fr) * 2006-04-19 2007-10-26 Tredi Sa Procede et dispositif pour la reduction des nox dans des effluents gazeux d'incinerateur.
AU2009355000B2 (en) * 2009-11-04 2013-09-12 Lg Electronics Inc. Visualization device for dust collection of vacuum cleaner
CN112601725A (zh) * 2019-08-01 2021-04-02 太平洋工程株式会社 水泥烧成装置和水泥窑排气的脱硝方法

Also Published As

Publication number Publication date
DE3513484A1 (de) 1986-10-16

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